Couchbase on windows 8

I downloaded couchbase server for windows 8 64bit. After installation, http://localhost:8091/index.html this link is not getting opened. I am new to this. Please guide me. I urgently need couchbase. Thanks in advance.

do you see the couchbase service started under services?
os there an error msg from localhost:8091 ?

Thanks for your reply.
This error “This web page is not available” appears when I http://localhost:8091/ open this page.